Year	Percent
1950	10.79786
1955	11.11949
1960	10.84414
1965	12.43879
1970	12.41416
1975	12.37614
1980	12.43696
1985	12.15216
1990	11.5707
1995	11.15025
2000	10.92522
2005	10.48046
2010	9.8986
2015	9.14604
2020	8.82138
2025	8.45947
2030	8.03425
2035	7.58408
2040	7.1641
2045	6.79646
2050	6.47323
2055	6.18162
2060	5.9182
2065	5.68003
2070	5.47485
2075	5.30104
2080	5.15449
2085	5.03674
2090	4.93462
2095	4.84671
2100	4.77097