Year	Percent
1950	27.99752
1955	28.32398
1960	26.32665
1965	24.28163
1970	23.93923
1975	25.87503
1980	27.53247
1985	28.13145
1990	29.3561
1995	30.38135
2000	32.27551
2005	35.03292
2010	36.7882
2015	36.92005
2020	35.58321
2025	33.28025
2030	31.83718
2035	31.44021
2040	31.2394
2045	31.02078
2050	30.37361
2055	29.18534
2060	28.19165
2065	27.49822
2070	27.01991
2075	26.57031
2080	26.03716
2085	25.43141
2090	24.86551
2095	24.42886
2100	24.12807