Year	Percent
1950	16.01335
1955	15.5388
1960	15.65428
1965	16.27227
1970	16.77379
1975	17.60414
1980	17.91872
1985	18.14562
1990	17.90809
1995	17.62863
2000	17.74854
2005	17.52164
2010	16.89581
2015	15.68632
2020	14.71289
2025	13.81657
2030	12.96941
2035	12.13613
2040	11.3496
2045	10.60913
2050	9.94561
2055	9.36105
2060	8.81381
2065	8.3348
2070	7.90066
2075	7.52265
2080	7.19664
2085	6.92459
2090	6.69657
2095	6.49537
2100	6.32778