Year	Percent
1950	12.73682
1955	13.72325
1960	13.17512
1965	13.29654
1970	13.64941
1975	13.76544
1980	14.28085
1985	10.79054
1990	13.28336
1995	13.32428
2000	16.89798
2005	17.62453
2010	14.47642
2015	14.72775
2020	14.53033
2025	13.81314
2030	13.46097
2035	13.03369
2040	12.42416
2045	11.72925
2050	11.05549
2055	10.41609
2060	9.86736
2065	9.34282
2070	8.84313
2075	8.33313
2080	7.84334
2085	7.42324
2090	7.04191
2095	6.7262
2100	6.43598