Year	Percent
1950	13.42304
1955	13.38104
1960	13.15622
1965	13.49154
1970	13.75956
1975	13.81457
1980	14.22344
1985	14.73181
1990	14.76443
1995	14.37051
2000	14.07216
2005	14.17755
2010	14.51758
2015	14.58079
2020	14.49754
2025	14.02195
2030	13.5457
2035	13.13498
2040	12.73444
2045	12.29847
2050	11.8095
2055	11.29771
2060	10.80759
2065	10.31861
2070	9.88665
2075	9.48889
2080	9.09161
2085	8.70496
2090	8.33581
2095	8.00763
2100	7.69154