Year	Percent
1950	4.43991
1955	4.42501
1960	4.43173
1965	4.57174
1970	4.87925
1975	5.30317
1980	5.44421
1985	5.61575
1990	6.6127
1995	7.09938
2000	7.80753
2005	8.90717
2010	10.46357
2015	12.05761
2020	14.33255
2025	17.00271
2030	19.41567
2035	21.32738
2040	23.64101
2045	26.34614
2050	29.11449
2055	31.60302
2060	33.65345
2065	34.99239
2070	36.20014
2075	37.10611
2080	37.75542
2085	38.14925
2090	38.39677
2095	38.58446
2100	38.76021