Year	Percent
1950	11.72597
1955	10.26346
1960	11.46066
1965	12.85652
1970	12.84692
1975	13.38975
1980	12.28519
1985	11.57861
1990	11.11423
1995	11.01648
2000	10.67483
2005	10.07794
2010	9.91022
2015	8.45895
2020	7.53893
2025	7.41735
2030	7.38187
2035	7.23797
2040	6.80217
2045	6.23887
2050	5.79489
2055	5.58752
2060	5.56913
2065	5.57126
2070	5.48056
2075	5.30993
2080	5.14176
2085	5.05001
2090	5.04964
2095	5.08275
2100	5.07679