Year	Percent
1950	9.9782
1955	9.38399
1960	9.70714
1965	10.65343
1970	8.57916
1975	6.89135
1980	6.75175
1985	7.12805
1990	7.79469
1995	6.55688
2000	5.71403
2005	5.03004
2010	4.53921
2015	4.44782
2020	4.2778
2025	4.26605
2030	4.23133
2035	4.13649
2040	4.06817
2045	4.06625
2050	4.11569
2055	4.17684
2060	4.22878
2065	4.26755
2070	4.29547
2075	4.32665
2080	4.36977
2085	4.41268
2090	4.43882
2095	4.45103
2100	4.43782