Year	Percent
1950	5.92299
1955	8.43205
1960	9.32656
1965	9.3777
1970	8.11005
1975	6.35225
1980	6.59391
1985	6.81045
1990	7.28122
1995	7.33151
2000	5.12518
2005	4.13784
2010	4.39771
2015	5.03049
2020	5.91603
2025	5.67173
2030	5.24752
2035	4.75038
2040	4.61552
2045	4.95289
2050	5.40127
2055	5.58414
2060	5.44597
2065	5.20396
2070	5.09621
2075	5.21183
2080	5.42743
2085	5.54585
2090	5.48657
2095	5.31494
2100	5.17583