Year	Percent
1950	30.59112
1955	29.08066
1960	27.94114
1965	27.31787
1970	27.39178
1975	27.75842
1980	25.39587
1985	25.9874
1990	26.98736
1995	27.61556
2000	28.01332
2005	29.15631
2010	31.39118
2015	33.26589
2020	33.86947
2025	33.48024
2030	32.76552
2035	31.5994
2040	30.73217
2045	29.98681
2050	28.82703
2055	27.58076
2060	26.32828
2065	25.20448
2070	24.22731
2075	23.38018
2080	22.6467
2085	22.0381
2090	21.55753
2095	21.19642
2100	20.93962