Year	Percent
1950	9.90945
1955	9.86641
1960	9.87542
1965	10.02801
1970	9.77742
1975	9.71071
1980	9.3929
1985	9.1174
1990	8.89496
1995	9.43393
2000	9.51124
2005	9.86903
2010	9.60732
2015	7.41067
2020	6.42921
2025	6.83043
2030	7.03196
2035	7.28971
2040	6.80772
2045	6.10356
2050	5.6112
2055	5.40488
2060	5.43689
2065	5.5142
2070	5.4513
2075	5.24636
2080	5.01607
2085	4.88695
2090	4.88464
2095	4.93808
2100	4.95996