Year	Percent
1950	15.25068
1955	15.3334
1960	15.96122
1965	16.18804
1970	13.72569
1975	13.35596
1980	11.99273
1985	12.59252
1990	11.08896
1995	10.91165
2000	9.44879
2005	8.34414
2010	7.47162
2015	7.21982
2020	6.86807
2025	6.48762
2030	6.05939
2035	5.64927
2040	5.39171
2045	5.33302
2050	5.33024
2055	5.25995
2060	5.13764
2065	5.00913
2070	4.91774
2075	4.88634
2080	4.89783
2085	4.90587
2090	4.87772
2095	4.82441
2100	4.77423