Year	Percent
1950	10.42769
1955	10.55658
1960	11.67068
1965	9.50532
1970	7.66213
1975	7.34124
1980	7.65671
1985	8.31861
1990	6.90391
1995	6.03054
2000	5.30594
2005	4.77506
2010	4.62658
2015	4.43057
2020	4.39768
2025	4.34556
2030	4.23632
2035	4.15587
2040	4.14729
2045	4.19724
2050	4.26394
2055	4.31532
2060	4.3468
2065	4.36791
2070	4.39814
2075	4.45343
2080	4.50741
2085	4.5429
2090	4.56075
2095	4.54987
2100	4.52771