Year	Percent
1950	9.27673
1955	10.86004
1960	10.70891
1965	11.1607
1970	10.71276
1975	9.85829
1980	9.39081
1985	7.83921
1990	7.46849
1995	7.78414
2000	7.81679
2005	7.06916
2010	6.5657
2015	6.83998
2020	6.49404
2025	6.30263
2030	6.12677
2035	5.91731
2040	5.70213
2045	5.56375
2050	5.49279
2055	5.42541
2060	5.35395
2065	5.26112
2070	5.16149
2075	5.07566
2080	5.0143
2085	4.96762
2090	4.92743
2095	4.87969
2100	4.82816