Year	Percent
1950	15.04631
1955	15.43962
1960	17.88766
1965	15.87575
1970	13.65192
1975	12.36918
1980	10.16832
1985	9.12999
1990	6.8131
1995	7.23464
2000	6.40222
2005	4.9363
2010	4.47424
2015	4.26907
2020	4.25912
2025	4.24379
2030	4.245
2035	4.03586
2040	3.68275
2045	3.52557
2050	3.58935
2055	3.75775
2060	3.93729
2065	4.04365
2070	4.01921
2075	3.92302
2080	3.90359
2085	4.00139
2090	4.14762
2095	4.26783
2100	4.28907