Year	Percent
1950	21.14591
1955	21.45199
1960	18.9089
1965	16.81806
1970	17.34571
1975	17.40478
1980	18.50103
1985	15.91599
1990	14.12895
1995	14.13016
2000	15.70074
2005	18.8379
2010	20.39391
2015	20.53822
2020	20.14238
2025	20.03085
2030	22.24359
2035	23.5445
2040	23.61613
2045	22.43043
2050	21.18509
2055	22.32336
2060	23.8986
2065	25.41292
2070	25.38746
2075	24.09993
2080	23.59362
2085	23.81662
2090	24.30526
2095	24.46976
2100	24.16487