Year	Percent
1950	11.079
1955	10.17942
1960	9.91507
1965	8.06351
1970	9.61188
1975	11.30036
1980	11.08773
1985	11.88164
1990	10.13253
1995	9.27528
2000	9.13676
2005	10.51275
2010	9.44136
2015	8.48879
2020	7.82749
2025	7.1376
2030	7.181
2035	6.80057
2040	6.40649
2045	6.15692
2050	5.93097
2055	5.73636
2060	5.58799
2065	5.45537
2070	5.32333
2075	5.19524
2080	5.09981
2085	5.033
2090	4.9876
2095	4.94527
2100	4.90475