Year	Percent
1950	6.7773
1955	7.89152
1960	6.75557
1965	7.0677
1970	8.05517
1975	7.73831
1980	6.49963
1985	5.66183
1990	6.00995
1995	6.29199
2000	6.14863
2005	5.64551
2010	5.31901
2015	5.78571
2020	5.82366
2025	5.72172
2030	5.5464
2035	5.30053
2040	5.17313
2045	5.21776
2050	5.3067
2055	5.32039
2060	5.25459
2065	5.15399
2070	5.0779
2075	5.06106
2080	5.0743
2085	5.06998
2090	5.02341
2095	4.94603
2100	4.87149