Year	Percent
1950	10.09202
1955	9.87257
1960	12.02863
1965	12.57981
1970	12.57143
1975	13.69889
1980	12.3454
1985	10.12292
1990	9.89692
1995	7.92676
2000	7.54714
2005	7.83686
2010	7.45127
2015	6.55202
2020	5.76302
2025	5.34038
2030	4.77035
2035	4.82852
2040	5.12685
2045	5.19842
2050	4.99091
2055	4.71739
2060	4.54101
2065	4.54985
2070	4.70289
2075	4.80472
2080	4.74224
2085	4.56134
2090	4.40275
2095	4.35914
2100	4.41308