Year	Percent
1950	10.72657
1955	9.14031
1960	8.53404
1965	12.37129
1970	12.30827
1975	11.5913
1980	10.38693
1985	11.07007
1990	9.69706
1995	9.46006
2000	9.80184
2005	9.44303
2010	9.21101
2015	8.09066
2020	7.06475
2025	7.13944
2030	6.76181
2035	6.3106
2040	5.89401
2045	5.5615
2050	5.33467
2055	5.249
2060	5.22379
2065	5.14541
2070	5.03717
2075	4.9368
2080	4.88693
2085	4.88213
2090	4.90127
2095	4.89442
2100	4.85861