Year	Percent
1950	6.74902
1955	6.15932
1960	8.92578
1965	8.41947
1970	8.14861
1975	8.12565
1980	7.75192
1985	7.51189
1990	6.50797
1995	6.66507
2000	6.43914
2005	6.02938
2010	5.99284
2015	6.08442
2020	6.06511
2025	5.8313
2030	5.63442
2035	5.52227
2040	5.50636
2045	5.55951
2050	5.58323
2055	5.53474
2060	5.45222
2065	5.38987
2070	5.36849
2075	5.36958
2080	5.35341
2085	5.30936
2090	5.24353
2095	5.17929
2100	5.14184