Year	Percent
1950	30.00425
1955	29.52722
1960	27.8233
1965	25.80151
1970	25.75247
1975	25.52876
1980	26.23129
1985	27.42826
1990	27.52719
1995	27.96292
2000	29.20906
2005	31.08185
2010	32.92925
2015	32.35762
2020	30.70842
2025	29.1741
2030	27.96671
2035	29.19048
2040	30.11923
2045	30.21406
2050	29.86681
2055	28.55386
2060	28.06392
2065	28.00666
2070	27.93473
2075	27.48325
2080	26.69622
2085	25.93859
2090	25.33634
2095	24.85795
2100	24.39865