Year	Percent
1950	12.26363
1955	7.87359
1960	8.19725
1965	11.04353
1970	12.55846
1975	12.78088
1980	12.24718
1985	11.75353
1990	11.36704
1995	12.60467
2000	13.80106
2005	12.61461
2010	11.3425
2015	9.65225
2020	10.21617
2025	10.84851
2030	10.37396
2035	9.51264
2040	8.71927
2045	8.39125
2050	8.37578
2055	8.27173
2060	7.87843
2065	7.36679
2070	6.96141
2075	6.74478
2080	6.60507
2085	6.42183
2090	6.14399
2095	5.8661
2100	5.64978