Year	Percent
1950	10.10132
1955	10.05693
1960	9.48399
1965	8.9925
1970	10.09592
1975	10.71128
1980	10.72641
1985	10.46393
1990	10.32337
1995	10.60674
2000	11.25038
2005	11.38495
2010	10.94967
2015	10.55245
2020	10.37722
2025	10.44329
2030	10.50415
2035	10.18086
2040	9.80511
2045	9.47669
2050	9.23622
2055	9.04908
2060	8.85762
2065	8.63828
2070	8.38211
2075	8.15412
2080	7.94912
2085	7.78548
2090	7.60058
2095	7.40604
2100	7.21325