Year	Percent
1950	11.88974
1955	11.88993
1960	13.54348
1965	14.49217
1970	16.09486
1975	15.22111
1980	13.38895
1985	11.74748
1990	11.82543
1995	11.14206
2000	10.84312
2005	10.41523
2010	8.81084
2015	7.79457
2020	6.98966
2025	7.65913
2030	7.07505
2035	6.42159
2040	5.82613
2045	5.37937
2050	5.15692
2055	5.05555
2060	4.94148
2065	4.73008
2070	4.44305
2075	4.23406
2080	4.14136
2085	4.14434
2090	4.152
2095	4.09421
2100	3.97157