Year	Percent
1950	23.88571
1955	28.03297
1960	31.65209
1965	32.59243
1970	29.54355
1975	31.03885
1980	32.16917
1985	34.46258
1990	32.87766
1995	31.69289
2000	29.19258
2005	28.89314
2010	28.83623
2015	28.85753
2020	28.44653
2025	27.26012
2030	26.69164
2035	25.74235
2040	24.85167
2045	24.07194
2050	23.05212
2055	22.29144
2060	21.79147
2065	21.46998
2070	21.2253
2075	21.02769
2080	20.84536
2085	20.7097
2090	20.6386
2095	20.62427
2100	20.619