Year	Percent
1950	8.93935
1955	8.44043
1960	8.05436
1965	8.12366
1970	8.0616
1975	8.36666
1980	8.44471
1985	7.78633
1990	8.36431
1995	8.53122
2000	7.6683
2005	7.73187
2010	7.89971
2015	7.51841
2020	7.0993
2025	6.81801
2030	6.58754
2035	6.41648
2040	6.25517
2045	6.06925
2050	5.85618
2055	5.66363
2060	5.52103
2065	5.41705
2070	5.32678
2075	5.24384
2080	5.16598
2085	5.09647
2090	5.04122
2095	5.00795
2100	4.97832