Year	Percent
1950	6.93138
1955	6.68279
1960	8.82922
1965	8.04414
1970	7.40926
1975	6.34166
1980	6.62394
1985	6.70346
1990	6.70349
1995	6.28049
2000	5.11954
2005	4.17556
2010	3.85479
2015	4.78497
2020	4.97506
2025	4.85725
2030	4.57962
2035	4.28183
2040	4.18699
2045	4.39622
2050	4.69469
2055	4.82507
2060	4.7571
2065	4.63662
2070	4.60602
2075	4.71806
2080	4.90009
2085	5.00923
2090	4.98206
2095	4.86806
2100	4.77851