Year	Percent
1950	30.36347
1955	29.89855
1960	30.45998
1965	28.48229
1970	29.02599
1975	31.08948
1980	33.34131
1985	33.93548
1990	31.82863
1995	30.09889
2000	29.70839
2005	31.47695
2010	32.51292
2015	31.94051
2020	29.28171
2025	25.57862
2030	23.64135
2035	22.48845
2040	22.20947
2045	22.12181
2050	20.9776
2055	19.87593
2060	19.35644
2065	19.48315
2070	19.9435
2075	20.41277
2080	20.57192
2085	20.40993
2090	20.22548
2095	20.26993
2100	20.51691