Year	Percent
1950	37.56864
1955	31.84349
1960	24.14301
1965	20.70403
1970	22.26568
1975	30.37769
1980	36.70869
1985	42.17137
1990	41.8015
1995	38.56946
2000	33.05069
2005	32.27129
2010	35.61044
2015	35.73806
2020	33.48571
2025	27.47993
2030	21.94346
2035	19.98426
2040	20.65338
2045	22.53732
2050	23.62705
2055	23.23965
2060	22.09587
2065	21.26404
2070	21.13803
2075	21.62607
2080	22.22645
2085	22.50333
2090	22.3088
2095	21.82214
2100	21.36124