Year	Percent
1950	5.54495
1955	5.27754
1960	5.23036
1965	5.23333
1970	5.26781
1975	5.2416
1980	5.22376
1985	5.08829
1990	4.93011
1995	4.52903
2000	4.21809
2005	4.19138
2010	4.20552
2015	4.24557
2020	4.3108
2025	4.49203
2030	4.83177
2035	5.38427
2040	6.07826
2045	6.90545
2050	7.7719
2055	8.74438
2060	9.91349
2065	11.2603
2070	12.76201
2075	14.16036
2080	15.49759
2085	16.79436
2090	18.06446
2095	19.29064
2100	20.45982