Year	Percent
1950	10.98175
1955	10.21228
1960	11.24541
1965	11.19332
1970	10.71967
1975	9.18247
1980	8.64447
1985	7.92094
1990	8.37271
1995	7.46998
2000	6.76676
2005	6.29553
2010	5.97495
2015	5.94255
2020	5.61292
2025	5.30568
2030	5.09461
2035	4.93443
2040	4.82184
2045	4.75951
2050	4.69861
2055	4.62463
2060	4.55564
2065	4.51401
2070	4.50641
2075	4.51445
2080	4.52101
2085	4.5177
2090	4.5064
2095	4.49845
2100	4.49718