Year	Percent
1950	20.90265
1955	21.45184
1960	21.03543
1965	21.39107
1970	22.15663
1975	22.83743
1980	22.86616
1985	22.64653
1990	22.58715
1995	22.90701
2000	25.07368
2005	27.17684
2010	29.04391
2015	31.71158
2020	33.21668
2025	32.24637
2030	29.71613
2035	26.30531
2040	22.97284
2045	22.02584
2050	22.8674
2055	23.6066
2060	24.19491
2065	23.86131
2070	22.77767
2075	22.27445
2080	22.24228
2085	22.58528
2090	22.92763
2095	22.98017
2100	22.70896