Year	Percent
1950	6.9707
1955	6.97522
1960	7.71531
1965	9.25333
1970	9.29099
1975	9.66119
1980	9.8985
1985	9.26677
1990	8.64047
1995	7.38652
2000	7.1631
2005	7.38752
2010	7.34868
2015	6.91147
2020	6.27457
2025	6.49261
2030	6.21639
2035	6.09566
2040	5.99011
2045	5.84112
2050	5.67275
2055	5.56553
2060	5.51263
2065	5.4531
2070	5.3819
2075	5.29092
2080	5.20218
2085	5.13596
2090	5.0918
2095	5.05109
2100	5.00957