Year	Percent
1950	10.88998
1955	10.93816
1960	9.49934
1965	8.90085
1970	10.46997
1975	10.33446
1980	10.14905
1985	8.74375
1990	8.50387
1995	7.76224
2000	8.0455
2005	7.4909
2010	7.17589
2015	6.63825
2020	6.22024
2025	6.23538
2030	5.88313
2035	5.57187
2040	5.36476
2045	5.23597
2050	5.14306
2055	5.08736
2060	5.02276
2065	4.94429
2070	4.87621
2075	4.83721
2080	4.83105
2085	4.83917
2090	4.84194
2095	4.83246
2100	4.81327