Year	Percent
1950	8.90143
1955	8.44199
1960	8.00227
1965	7.75433
1970	7.53764
1975	6.07496
1980	5.50205
1985	5.70216
1990	6.01608
1995	6.08779
2000	5.7847
2005	5.48946
2010	5.20067
2015	4.98848
2020	4.83822
2025	4.75725
2030	4.70611
2035	4.65341
2040	4.60367
2045	4.56915
2050	4.5671
2055	4.58117
2060	4.60944
2065	4.63063
2070	4.62755
2075	4.61684
2080	4.60382
2085	4.58998
2090	4.57582
2095	4.55662
2100	4.52176