The Kinsey Institute suggested that approximately 10 percent of the population may be gay, lesbian, bisexual, or transgender. This would equal approximately 28 million (per the U.S. 2000 census). However, the basis for the percentage is greatly disputed. Gay men, lesbians, and bisexual people are found in all walks of life, among all racial/ethnic groups, and at all socioeconomic levels. In addition, the number of transgender people is greatly disputed and largely unknown. The number is probably higher than experts estimate because the estimates are usually based on the number of people who undergo sexual reassignment surgery, and many transgender people do not pursue this surgery.