Year	Percent
1950	8.60095
1955	9.66982
1960	9.49341
1965	8.38279
1970	8.1678
1975	7.74161
1980	7.77978
1985	7.7972
1990	7.02888
1995	6.1804
2000	5.06538
2005	4.54751
2010	4.39441
2015	5.05425
2020	5.23915
2025	5.01045
2030	4.65596
2035	4.35679
2040	4.30968
2045	4.53444
2050	4.81834
2055	4.93325
2060	4.85368
2065	4.71988
2070	4.68262
2075	4.78614
2080	4.94525
2085	5.04022
2090	4.99925
2095	4.8757
2100	4.76837