Year	Percent
1950	5.05194
1955	5.21972
1960	5.3232
1965	5.37147
1970	5.37638
1975	5.36231
1980	5.06202
1985	4.86763
1990	4.93731
1995	4.61498
2000	4.51936
2005	4.43458
2010	4.38537
2015	4.38357
2020	4.42324
2025	4.49772
2030	4.66378
2035	4.84673
2040	5.02005
2045	5.28655
2050	5.70208
2055	6.23132
2060	6.93497
2065	7.66745
2070	8.49076
2075	9.38676
2080	10.42846
2085	11.55101
2090	12.74338
2095	13.98226
2100	15.24472