Year	Percent
1950	19.09389
1955	18.52048
1960	18.8599
1965	18.96847
1970	19.01536
1975	18.99859
1980	18.93061
1985	18.58874
1990	18.27043
1995	17.89835
2000	17.48541
2005	18.02576
2010	17.84343
2015	17.48161
2020	16.62859
2025	15.92464
2030	15.33933
2035	14.75705
2040	14.11767
2045	13.45259
2050	12.78372
2055	12.17202
2060	11.61672
2065	11.07206
2070	10.56247
2075	10.06253
2080	9.59103
2085	9.15659
2090	8.76114
2095	8.38086
2100	8.01098