Are there any peer-reviewed studies that show what percent of the population are believed to have Narcissistic Personality Disorder that have been published within the past ten years? I have read about studies that list the percent of people with NPD, but all of them came out on or before two thousand ten and may no longer be accurate and some of them weren't even peer-reviewed.
While not a peer-reviewed study per se, but the DSM-5 says that the prevalence of Narcissistic Personality Disorder in the population is 6.2%, or approximately one out of sixteen members of the population (6.25%). The DSM-V was published in 2013 and is a peer-reviewed text, so it is within the 10 year criteria you mentioned and this fact is mentioned in more recent sources like an article for Psychiatric Times published in 2016. Another study from 2019 doesn't mention Narcissistic Personality Disorder, but does mention how approximately 3% of the population (or about 1 in 33) has Antisocial Personality Disorder, another disorder that is a common dual-diagnosis with Narcissistic Personality Disorder. Then, there is a 2020 study that shows 1.6% (1 in 60) to 5.9% (1 in 17) of people have borderline personality disorder or BPD, which can be associated with a lack of empathy and lead to behaviors that can be mistaken for NPD. This is similar to Histrionic Personality Disorder (which doesn't cause people to suffer from a lack of empathy like with NPD, but can appear that way due to how it is difficult for those with HPD to recognize the emotions of others and thus lack emotional intelligence) that affects less than or equal to 2% of the population according to the University of Arizona College of Medicine.
In response to your question on the prevalence of NPD, I've listed some research here:
Dhawan, Kunik, Oldham, and Coverdale (2010) did a systematic review of literature on the prevalence and treatment of NPD from Jan 1980 to Aug 2008.
Twenge and Foster (2010) updates a US based meta analysis of the prevalence of NPD among college students (based on literature from 1982 to 2008). Second, they compare NDP scores of students over time on one college campus (1994-2009).
Wilson & Sibley (2011) assess prevalence of NPD in New Zealand, unlike many studies that are based in the US. Increasing with age was related to lower Narcissism scores.
Related, I recommend Campbell, Miller, & Buffardi's (2010) research that attends to cultural influences, and change over time in NPD.
More specifically, Campbell, Miller, & Buffardi (2010) use perceptions of national character (PNCs) to assess cultural levels of narcissism. In their first study,
archival data show that American perceptions of national character (PNCs) assessed with the five factor model (FFM) closely fit with the profile of narcissistic personality disorder (NPD).
Furthermore, cross-national comparison shows
that U.S. PNCs of NPD were the highest among examined cultures.
Here is a reference that is a little later than 2010 on this topic, that may help find more empirical research after 2010:
Dhawan, Kunik, Oldham, Coverdale, (2010) Prevalence and treatment of narcissistic personality disorder in the community: a systematic review,Comprehensive Psychiatry.
Twenge, J. M., & Foster, J. D. (2010). Birth Cohort Increases in Narcissistic Personality Traits Among American College Students, 1982–2009. Social Psychological and Personality Science, 1(1), 99–106. https://doi.org/10.1177/1948550609355719
Wilson, M. S., & Sibley, C. G. (2011). 'Narcissism creep?': Evidence for Age-Related Differences in Narcissism in the New Zealand General Population. New Zealand Journal of Psychology, 40(3).
Keith Campbell, W., Miller, J. D., & Buffardi, L. E. (2010). The United States and the “Culture of Narcissism”: An Examination of Perceptions of National Character. Social Psychological and Personality Science, 1(3), 222–229. https://doi.org/10.1177/1948550610366878