Year	Percent
1950	13.5877
1955	12.32344
1960	12.90661
1965	13.47927
1970	13.8754
1975	14.20142
1980	14.61358
1985	14.86076
1990	15.04742
1995	14.5774
2000	13.95824
2005	14.46756
2010	14.74438
2015	14.34324
2020	13.6659
2025	13.17683
2030	12.76465
2035	12.37068
2040	11.92438
2045	11.44406
2050	10.94246
2055	10.4687
2060	10.03336
2065	9.61454
2070	9.23096
2075	8.84226
2080	8.46247
2085	8.10441
2090	7.76076
2095	7.44268
2100	7.13122