Year	Percent
1950	14.92305
1955	13.82714
1960	13.90647
1965	14.29114
1970	13.80685
1975	14.96601
1980	16.15736
1985	16.03354
1990	14.77681
1995	14.25291
2000	13.94274
2005	13.61333
2010	13.5463
2015	13.38867
2020	12.63485
2025	11.67978
2030	11.04674
2035	10.63506
2040	10.27729
2045	9.85882
2050	9.38257
2055	8.88008
2060	8.44565
2065	8.06476
2070	7.74062
2075	7.41405
2080	7.08554
2085	6.76436
2090	6.47322
2095	6.21784
2100	6.01313