Year	Percent
1950	31.62837
1955	30.45077
1960	29.56027
1965	28.65166
1970	27.58759
1975	28.19432
1980	28.2374
1985	27.97801
1990	27.92405
1995	28.16705
2000	28.45441
2005	28.39932
2010	28.81896
2015	30.54059
2020	32.96404
2025	34.84037
2030	35.28238
2035	33.95375
2040	31.69212
2045	29.39215
2050	27.55962
2055	26.35021
2060	24.87697
2065	23.3916
2070	22.16224
2075	21.35234
2080	20.85765
2085	20.48457
2090	20.16371
2095	19.899
2100	19.72842