Year	Percent
1950	10.17522
1955	10.72161
1960	8.74809
1965	9.63896
1970	8.03488
1975	9.00708
1980	8.76143
1985	10.14939
1990	9.82111
1995	10.43903
2000	10.91718
2005	10.55835
2010	10.60367
2015	10.91455
2020	11.13869
2025	11.22804
2030	11.26714
2035	11.05466
2040	10.78884
2045	10.51515
2050	10.23474
2055	9.91311
2060	9.5304
2065	9.12676
2070	8.74763
2075	8.42379
2080	8.1406
2085	7.8939
2090	7.6537
2095	7.42484
2100	7.21691