Year	Percent
1950	31.22994
1955	29.39266
1960	28.05743
1965	26.41505
1970	28.26559
1975	32.03309
1980	37.16059
1985	40.7104
1990	42.24898
1995	38.41845
2000	33.48933
2005	31.64894
2010	30.16801
2015	28.08039
2020	26.36436
2025	24.76672
2030	23.48752
2035	21.83111
2040	20.5135
2045	19.71894
2050	19.36494
2055	19.13218
2060	18.92237
2065	18.70011
2070	18.42339
2075	18.19906
2080	18.06956
2085	18.00635
2090	17.94542
2095	17.85053
2100	17.70721