Year	Percent
1950	9.87941
1955	10.65188
1960	10.70395
1965	10.65601
1970	9.78456
1975	9.89533
1980	11.11317
1985	11.26134
1990	10.88842
1995	10.75248
2000	10.56953
2005	11.19399
2010	12.05573
2015	11.37457
2020	10.29728
2025	10.13976
2030	10.15761
2035	10.03347
2040	9.67198
2045	9.21018
2050	8.79347
2055	8.47874
2060	8.2335
2065	7.98506
2070	7.70279
2075	7.3917
2080	7.10794
2085	6.84974
2090	6.6272
2095	6.41617
2100	6.21187