Year	Percent
1950	30.43561
1955	28.86822
1960	25.61247
1965	23.29955
1970	21.1679
1975	23.10098
1980	24.60643
1985	27.37391
1990	28.9669
1995	31.14656
2000	31.6722
2005	32.96139
2010	31.65889
2015	32.18873
2020	32.32333
2025	30.65472
2030	28.28903
2035	25.09239
2040	22.39645
2045	20.90963
2050	20.38654
2055	19.76876
2060	19.05634
2065	18.43384
2070	18.01674
2075	17.88367
2080	18.01066
2085	18.23361
2090	18.40032
2095	18.4835
2100	18.52121