Year	Percent
1950	18.064
1955	20.62245
1960	19.76787
1965	20.32612
1970	19.07443
1975	17.26899
1980	15.64957
1985	14.65841
1990	14.208
1995	14.76695
2000	14.6601
2005	14.00719
2010	13.89544
2015	12.50729
2020	11.29839
2025	10.86653
2030	10.7763
2035	10.76355
2040	10.45467
2045	9.78655
2050	8.99244
2055	8.37395
2060	8.06928
2065	7.89592
2070	7.64015
2075	7.20138
2080	6.68453
2085	6.23062
2090	5.94409
2095	5.77171
2100	5.62705