Year	Percent
1950	18.76056
1955	18.22718
1960	17.24413
1965	15.98834
1970	14.61708
1975	13.5697
1980	12.90325
1985	12.72184
1990	12.38472
1995	12.25225
2000	12.22352
2005	12.32888
2010	12.67859
2015	13.03903
2020	13.46732
2025	13.94737
2030	14.53659
2035	15.30027
2040	16.13975
2045	16.99883
2050	17.89933
2055	18.75334
2060	19.5219
2065	20.23719
2070	20.87031
2075	21.44134
2080	21.98978
2085	22.48349
2090	22.92063
2095	23.31829
2100	23.67459