Year	Percent
1950	17.45448
1955	18.08788
1960	17.97723
1965	18.24776
1970	18.16524
1975	16.87825
1980	15.53871
1985	13.65857
1990	13.12914
1995	11.5099
2000	10.6567
2005	9.64928
2010	8.58183
2015	8.31311
2020	7.6129
2025	7.12758
2030	6.63688
2035	6.23594
2040	5.93979
2045	5.74466
2050	5.58393
2055	5.41902
2060	5.25415
2065	5.09693
2070	4.98655
2075	4.9077
2080	4.84923
2085	4.78076
2090	4.71368
2095	4.6452
2100	4.59002