Year	Percent
1950	12.62579
1955	11.85224
1960	14.33646
1965	13.9435
1970	13.00725
1975	13.04033
1980	11.9532
1985	9.38806
1990	11.36529
1995	10.32669
2000	9.1954
2005	9.21826
2010	8.52355
2015	7.77132
2020	7.29743
2025	7.03065
2030	6.77248
2035	6.44101
2040	6.08051
2045	5.79385
2050	5.60612
2055	5.50719
2060	5.43228
2065	5.33395
2070	5.21377
2075	5.1036
2080	5.01879
2085	4.9756
2090	4.93948
2095	4.9016
2100	4.84084