Year	Percent
1950	6.58287
1955	7.12025
1960	7.80409
1965	6.91646
1970	6.47376
1975	7.6222
1980	8.47988
1985	8.18281
1990	6.65034
1995	5.75638
2000	5.96596
2005	5.94638
2010	5.99183
2015	5.26364
2020	4.81142
2025	4.62374
2030	4.69259
2035	4.908
2040	4.9451
2045	4.80956
2050	4.62096
2055	4.53822
2060	4.60785
2065	4.7586
2070	4.88513
2075	4.90637
2080	4.84809
2085	4.77789
2090	4.76082
2095	4.78971
2100	4.83022