Year	Percent
1950	10.50482
1955	10.3726
1960	11.19431
1965	13.25125
1970	13.19488
1975	13.09763
1980	13.14575
1985	13.59175
1990	14.00007
1995	13.92664
2000	13.07773
2005	12.11833
2010	11.83715
2015	13.1212
2020	13.10969
2025	10.73381
2030	9.49343
2035	8.83202
2040	8.3913
2045	8.07237
2050	7.72428
2055	7.20457
2060	6.68061
2065	6.27406
2070	6.01306
2075	5.83797
2080	5.67985
2085	5.5097
2090	5.34107
2095	5.20213
2100	5.12031