Year	Percent
1950	28.79765
1955	29.64444
1960	29.72501
1965	29.35052
1970	28.10173
1975	26.40366
1980	26.07824
1985	26.51618
1990	26.89787
1995	27.44171
2000	28.09451
2005	29.32993
2010	30.82339
2015	31.77833
2020	32.16722
2025	31.75606
2030	31.43786
2035	31.63042
2040	31.75269
2045	31.85822
2050	31.28912
2055	30.3397
2060	29.61903
2065	29.19609
2070	28.92015
2075	28.51379
2080	27.8914
2085	27.19831
2090	26.59539
2095	26.16151
2100	25.80609