Year	Percent
1950	9.99843
1955	9.76533
1960	9.7141
1965	10.09471
1970	10.52738
1975	10.28881
1980	10.44398
1985	10.71309
1990	10.85948
1995	10.60349
2000	10.92578
2005	11.97322
2010	12.23128
2015	10.72586
2020	9.8383
2025	9.6897
2030	9.23039
2035	8.75743
2040	8.18872
2045	7.64976
2050	7.18544
2055	6.79027
2060	6.44421
2065	6.13932
2070	5.87865
2075	5.66502
2080	5.50921
2085	5.39116
2090	5.2896
2095	5.20396
2100	5.13528