Year	Percent
1950	11.19734
1955	10.98108
1960	11.38856
1965	12.9276
1970	12.48787
1975	11.93285
1980	12.12871
1985	11.06281
1990	8.59872
1995	10.51435
2000	9.89909
2005	9.25268
2010	8.68789
2015	8.07717
2020	7.39079
2025	6.96942
2030	6.75398
2035	6.55167
2040	6.27727
2045	5.97315
2050	5.73108
2055	5.57782
2060	5.50594
2065	5.44309
2070	5.3509
2075	5.23185
2080	5.13059
2085	5.05694
2090	5.01996
2095	4.99243
2100	4.95349