Year	Percent
1950	11.03389
1955	11.41431
1960	11.29702
1965	12.83566
1970	12.8851
1975	12.62383
1980	12.8568
1985	13.80228
1990	12.50249
1995	11.28125
2000	10.66923
2005	10.28229
2010	9.89512
2015	8.99614
2020	8.27055
2025	7.92414
2030	7.40002
2035	6.8677
2040	6.37186
2045	5.965
2050	5.64598
2055	5.40918
2060	5.2147
2065	5.05295
2070	4.90043
2075	4.79087
2080	4.70569
2085	4.65226
2090	4.61879
2095	4.59039
2100	4.5695