Year	Percent
1950	8.25531
1955	8.47894
1960	11.0732
1965	9.64996
1970	8.7294
1975	8.15871
1980	7.33223
1985	6.16596
1990	6.52099
1995	6.4645
2000	6.12552
2005	6.28313
2010	5.54326
2015	5.31981
2020	5.56183
2025	5.43561
2030	5.47952
2035	5.44256
2040	5.33681
2045	5.25572
2050	5.25841
2055	5.30006
2060	5.3108
2065	5.27312
2070	5.21092
2075	5.14321
2080	5.10388
2085	5.08524
2090	5.06863
2095	5.03879
2100	4.98756