Year	Percent
1950	13.07796
1955	13.80822
1960	15.24725
1965	15.44836
1970	15.4206
1975	15.69499
1980	15.48354
1985	15.5959
1990	15.33787
1995	14.71978
2000	14.2845
2005	13.42438
2010	12.41775
2015	11.04066
2020	9.73401
2025	9.18417
2030	8.63712
2035	8.0465
2040	7.43347
2045	6.88447
2050	6.43849
2055	6.07818
2060	5.79963
2065	5.56219
2070	5.36759
2075	5.18021
2080	5.03828
2085	4.93194
2090	4.86216
2095	4.81037
2100	4.76796