Year	Percent
1950	11.36677
1955	12.77405
1960	11.38075
1965	9.94313
1970	8.82731
1975	9.59212
1980	10.08454
1985	9.1435
1990	8.23109
1995	7.13771
2000	5.60719
2005	5.06663
2010	5.47023
2015	5.52006
2020	5.41265
2025	5.17158
2030	4.81789
2035	4.54846
2040	4.55047
2045	4.72209
2050	4.84481
2055	4.84123
2060	4.74834
2065	4.65108
2070	4.64354
2075	4.74168
2080	4.86263
2085	4.92182
2090	4.88155
2095	4.80103
2100	4.73762