Year	Percent
1950	28.73799
1955	27.74807
1960	26.75912
1965	26.81448
1970	26.82209
1975	30.40284
1980	33.62474
1985	33.25285
1990	32.40157
1995	31.91128
2000	31.55978
2005	32.22453
2010	33.41306
2015	33.88235
2020	31.48948
2025	29.14476
2030	27.3104
2035	25.96095
2040	24.60064
2045	23.33639
2050	22.30961
2055	21.50406
2060	21.034
2065	20.90643
2070	20.86015
2075	20.77066
2080	20.6174
2085	20.48385
2090	20.44536
2095	20.48185
2100	20.52904