Year	Percent
1950	11.418
1955	11.35789
1960	11.56007
1965	11.84443
1970	9.80642
1975	10.30518
1980	9.07952
1985	10.05441
1990	11.40848
1995	11.92812
2000	12.22762
2005	9.56852
2010	7.51136
2015	7.04026
2020	7.73662
2025	7.494
2030	6.28045
2035	5.65338
2040	5.52587
2045	5.56138
2050	5.50806
2055	5.31337
2060	5.11882
2065	5.03845
2070	5.0456
2075	5.08616
2080	5.09494
2085	5.07394
2090	5.02794
2095	5.00849
2100	5.01178