Year	Percent
1950	6.67669
1955	5.67664
1960	7.21521
1965	8.6147
1970	8.20559
1975	6.7542
1980	6.22603
1985	6.23326
1990	7.73926
1995	8.1756
2000	6.39338
2005	6.02682
2010	5.51202
2015	4.11105
2020	4.36885
2025	5.20634
2030	5.09705
2035	5.02529
2040	4.81413
2045	4.52707
2050	4.4261
2055	4.68039
2060	4.98839
2065	5.10126
2070	5.05707
2075	4.94189
2080	4.85805
2085	4.89588
2090	5.02573
2095	5.11135
2100	5.08335