Year	Percent
1950	17.75791
1955	16.93353
1960	15.6851
1965	14.63294
1970	13.60852
1975	13.21179
1980	12.74121
1985	12.0157
1990	11.4499
1995	11.60431
2000	11.87679
2005	12.41873
2010	13.05773
2015	13.5867
2020	14.18825
2025	14.74119
2030	15.37531
2035	16.25112
2040	17.37298
2045	18.44516
2050	19.34617
2055	19.97419
2060	20.50672
2065	21.11909
2070	21.75268
2075	22.34365
2080	22.77182
2085	23.09484
2090	23.38333
2095	23.6718
2100	23.92933