Year	Percent
1950	15.84127
1955	15.80167
1960	18.26621
1965	16.19927
1970	14.00806
1975	12.76054
1980	10.49732
1985	9.43045
1990	7.26616
1995	7.7061
2000	6.6954
2005	5.16271
2010	4.61885
2015	4.41239
2020	4.40589
2025	4.39486
2030	4.40308
2035	4.19549
2040	3.83927
2045	3.68657
2050	3.76289
2055	3.94554
2060	4.13486
2065	4.24403
2070	4.21439
2075	4.11003
2080	4.08777
2085	4.189
2090	4.3408
2095	4.46025
2100	4.47432