Year	Percent
1950	27.96524
1955	26.5816
1960	25.40744
1965	24.48782
1970	25.06257
1975	27.2031
1980	29.51893
1985	31.90264
1990	33.53564
1995	33.31963
2000	33.32669
2005	33.14593
2010	32.66177
2015	32.7151
2020	31.9122
2025	30.74516
2030	29.3712
2035	27.87401
2040	26.65627
2045	25.36753
2050	24.27954
2055	23.39596
2060	22.65596
2065	22.09687
2070	21.66457
2075	21.34047
2080	21.10337
2085	20.92524
2090	20.80047
2095	20.71842
2100	20.66061