Year	Percent
1950	6.09582
1955	6.31764
1960	6.47779
1965	7.01683
1970	7.63138
1975	6.9438
1980	5.86529
1985	5.23736
1990	5.21287
1995	5.87451
2000	5.69911
2005	5.28277
2010	5.0407
2015	4.93289
2020	4.75957
2025	4.63234
2030	4.57275
2035	4.53993
2040	4.51487
2045	4.49179
2050	4.48144
2055	4.49652
2060	4.52163
2065	4.55395
2070	4.57592
2075	4.57711
2080	4.56748
2085	4.55412
2090	4.53794
2095	4.52578
2100	4.50738