Year	Percent
1950	7.73966
1955	9.53262
1960	9.47633
1965	8.57385
1970	7.77145
1975	6.99106
1980	7.14119
1985	6.92167
1990	6.7801
1995	6.25629
2000	5.43623
2005	5.53049
2010	4.79295
2015	5.13442
2020	4.93311
2025	4.62674
2030	4.42068
2035	4.3322
2040	4.3062
2045	4.36652
2050	4.44627
2055	4.43716
2060	4.36386
2065	4.3249
2070	4.35152
2075	4.42446
2080	4.50744
2085	4.55532
2090	4.54705
2095	4.51759
2100	4.50979