Year	Percent
1950	10.40885
1955	10.25882
1960	9.85356
1965	9.77978
1970	10.5765
1975	10.6972
1980	10.66845
1985	10.58009
1990	10.75507
1995	10.43928
2000	9.83994
2005	10.06452
2010	10.86835
2015	10.65607
2020	9.03582
2025	8.27277
2030	7.87005
2035	7.73512
2040	7.37355
2045	6.86201
2050	6.33533
2055	5.90365
2060	5.61859
2065	5.43769
2070	5.26953
2075	5.08425
2080	4.89851
2085	4.76626
2090	4.69304
2095	4.66766
2100	4.65081