Year	Percent
1950	18.74728
1955	18.30031
1960	17.39819
1965	16.36628
1970	15.21323
1975	14.38792
1980	13.855
1985	13.76085
1990	13.49232
1995	13.09651
2000	12.88107
2005	12.81664
2010	13.02716
2015	13.38938
2020	13.8037
2025	14.2575
2030	14.81582
2035	15.53596
2040	16.33248
2045	17.15974
2050	18.03664
2055	18.87857
2060	19.64444
2065	20.35842
2070	20.99047
2075	21.55986
2080	22.10387
2085	22.59101
2090	23.01783
2095	23.39671
2100	23.72497