Year	Percent
1950	16.19367
1955	16.09936
1960	15.18302
1965	14.82868
1970	14.54592
1975	14.58316
1980	15.27646
1985	15.81631
1990	16.29189
1995	18.13114
2000	19.88424
2005	23.31973
2010	26.18478
2015	28.20993
2020	27.39108
2025	26.58822
2030	25.36494
2035	25.06228
2040	26.36045
2045	25.55571
2050	24.73619
2055	23.90541
2060	21.43308
2065	21.148
2070	22.2004
2075	22.21744
2080	21.77476
2085	21.01927
2090	20.45446
2095	20.4134
2100	20.76594