Major companies in the travel industry have become aware of the substantial money (also known as the "pink dollar" or "pink pound") generated by this marketing niche and have made it a point to align themselves with the gay community and gay tourism campaigns. According to a 2000 Travel University report, 10% of international tourists were gay and lesbian, accounting for more than 70 million arrivals worldwide. This market segment is expected to continue to grow as a result of ongoing acceptance of LGBT people and changing attitudes towards sexual and gender minorities. Outside larger companies, LGBT tourists are offered other traditional tourism tools, such as hospitality networks of LGBT individuals who offer each other hospitality during their travels and even home swaps where people live in each other's homes. Also available worldwide are social groups for resident and visiting gay, lesbian, bisexual, and transgender expatriates and friends.