Year	Percent
1950	10.23567
1955	10.16731
1960	9.90051
1965	9.85981
1970	10.64573
1975	10.64277
1980	10.56677
1985	10.59744
1990	10.87525
1995	11.04455
2000	10.82715
2005	10.24998
2010	10.16072
2015	10.52126
2020	10.41098
2025	10.14635
2030	9.72428
2035	9.44714
2040	9.23994
2045	9.04434
2050	8.85093
2055	8.63247
2060	8.41586
2065	8.20077
2070	8.02141
2075	7.85503
2080	7.69021
2085	7.52535
2090	7.34651
2095	7.1755
2100	7.00623