Year	Percent
1950	28.94254
1955	28.81856
1960	28.38091
1965	28.56031
1970	29.07504
1975	29.20531
1980	28.99672
1985	28.83346
1990	29.99994
1995	33.33893
2000	32.9439
2005	31.91125
2010	29.52553
2015	28.98871
2020	29.29738
2025	29.64228
2030	28.92041
2035	27.74789
2040	26.9931
2045	26.53634
2050	26.25553
2055	25.6988
2060	25.0762
2065	24.4621
2070	23.9115
2075	23.46665
2080	23.13535
2085	22.85744
2090	22.57543
2095	22.27868
2100	21.9855