Year	Percent
1950	29.67717
1955	28.58339
1960	27.10272
1965	25.7732
1970	24.12279
1975	24.94032
1980	26.14079
1985	26.74278
1990	27.98991
1995	28.95925
2000	30.24876
2005	32.18521
2010	33.71501
2015	34.21075
2020	33.62111
2025	32.13202
2030	30.67633
2035	29.32837
2040	28.14657
2045	26.99956
2050	25.62527
2055	24.2798
2060	23.06396
2065	22.08427
2070	21.31753
2075	20.72634
2080	20.23674
2085	19.8396
2090	19.52706
2095	19.28686
2100	19.12893