Year	Percent
1950	16.79986
1955	18.99236
1960	18.7445
1965	18.85436
1970	18.75323
1975	18.49172
1980	19.3598
1985	20.63912
1990	20.63629
1995	19.86199
2000	18.4233
2005	17.57054
2010	18.35112
2015	18.5882
2020	17.95997
2025	16.77368
2030	15.63017
2035	14.98952
2040	14.61588
2045	14.11879
2050	13.39436
2055	12.61088
2060	11.92459
2065	11.41707
2070	11.00698
2075	10.56497
2080	10.07089
2085	9.54207
2090	9.09879
2095	8.71099
2100	8.37169