Year	Percent
1950	10.25428
1955	9.11396
1960	8.20329
1965	9.42864
1970	10.46201
1975	10.56977
1980	10.61134
1985	10.66765
1990	11.07774
1995	11.56599
2000	11.92114
2005	11.68538
2010	10.64539
2015	10.9326
2020	10.95604
2025	10.91493
2030	10.22685
2035	9.83926
2040	9.52423
2045	9.27184
2050	8.99228
2055	8.65706
2060	8.30953
2065	8.00472
2070	7.71974
2075	7.45295
2080	7.19551
2085	6.93827
2090	6.67467
2095	6.43851
2100	6.24086