Year	Percent
1950	10.42741
1955	9.49386
1960	11.51906
1965	11.94397
1970	12.8475
1975	12.52835
1980	10.59581
1985	10.09636
1990	8.14482
1995	7.76573
2000	7.47424
2005	7.19684
2010	6.7951
2015	6.72092
2020	6.47777
2025	6.32041
2030	6.15979
2035	6.03944
2040	5.95099
2045	5.90066
2050	5.87956
2055	5.86325
2060	5.82668
2065	5.77774
2070	5.71393
2075	5.66022
2080	5.6074
2085	5.56349
2090	5.51268
2095	5.4574
2100	5.40321