Year	Percent
1950	17.31167
1955	17.82616
1960	18.62111
1965	13.53275
1970	12.53044
1975	8.75041
1980	9.39906
1985	10.7849
1990	9.74451
1995	7.36853
2000	6.44342
2005	4.76091
2010	3.56712
2015	3.58916
2020	3.2011
2025	3.01771
2030	3.07495
2035	3.20707
2040	3.26689
2045	3.22664
2050	3.1771
2055	3.19108
2060	3.25376
2065	3.33182
2070	3.38592
2075	3.42152
2080	3.4458
2085	3.49505
2090	3.56519
2095	3.64443
2100	3.71675