Year	Percent
1950	31.66564
1955	30.58998
1960	32.18003
1965	29.84266
1970	27.73194
1975	28.70269
1980	29.25447
1985	30.80799
1990	30.24119
1995	28.949
2000	28.19018
2005	29.84659
2010	31.9124
2015	33.12476
2020	31.55382
2025	28.01232
2030	23.30038
2035	21.0047
2040	20.45989
2045	20.56962
2050	19.83809
2055	18.60909
2060	17.88076
2065	17.85481
2070	18.3059
2075	18.94307
2080	19.37715
2085	19.46591
2090	19.39843
2095	19.44945
2100	19.70984