Year	Percent
1950	28.40961
1955	28.67125
1960	30.83106
1965	30.26879
1970	30.15583
1975	30.30581
1980	30.0317
1985	31.25475
1990	31.83133
1995	30.13173
2000	30.16733
2005	29.66912
2010	28.5933
2015	26.43248
2020	23.41845
2025	20.85462
2030	19.80676
2035	20.19661
2040	20.96855
2045	21.53318
2050	21.09307
2055	20.34291
2060	20.02236
2065	20.34735
2070	21.07162
2075	21.67539
2080	21.75889
2085	21.35834
2090	20.86575
2095	20.63102
2100	20.71075