Year	Percent
1950	6.64065
1955	6.29113
1960	5.92579
1965	6.002
1970	6.13299
1975	7.17083
1980	7.86198
1985	7.23948
1990	6.13417
1995	5.39966
2000	5.47252
2005	5.57831
2010	5.71747
2015	5.32615
2020	5.0657
2025	4.98246
2030	4.83684
2035	4.73852
2040	4.71022
2045	4.71079
2050	4.71506
2055	4.7188
2060	4.71572
2065	4.72379
2070	4.7375
2075	4.75645
2080	4.76462
2085	4.75473
2090	4.73488
2095	4.71303
2100	4.69117