Year	Percent
1950	17.71781
1955	16.80669
1960	17.15524
1965	16.6369
1970	16.27409
1975	15.52119
1980	15.70233
1985	16.0021
1990	15.74775
1995	13.35697
2000	11.83393
2005	11.72331
2010	11.73342
2015	13.19544
2020	11.72664
2025	10.47671
2030	9.75898
2035	9.59353
2040	9.4907
2045	9.04391
2050	8.46864
2055	7.93972
2060	7.55272
2065	7.29138
2070	7.02934
2075	6.73299
2080	6.42148
2085	6.14402
2090	5.91802
2095	5.73954
2100	5.58065