Year	Percent
1950	8.25272
1955	9.7619
1960	7.71038
1965	6.81415
1970	7.2879
1975	8.06158
1980	9.12672
1985	8.57612
1990	6.01624
1995	5.55111
2000	5.89378
2005	6.04228
2010	5.4051
2015	5.28038
2020	4.79704
2025	4.54157
2030	4.63678
2035	4.82894
2040	4.93345
2045	4.85028
2050	4.69796
2055	4.60933
2060	4.63375
2065	4.75524
2070	4.87687
2075	4.92296
2080	4.88652
2085	4.81832
2090	4.76936
2095	4.77739
2100	4.80651