Year	Percent
1950	13.00242
1955	10.29411
1960	8.19092
1965	7.97834
1970	8.26179
1975	8.70629
1980	7.03461
1985	6.02216
1990	5.22489
1995	4.65398
2000	4.46446
2005	4.21482
2010	4.11473
2015	4.01053
2020	3.86305
2025	3.75337
2030	3.71847
2035	3.74693
2040	3.80437
2045	3.85643
2050	3.88321
2055	3.88596
2060	3.89739
2065	3.95015
2070	4.02944
2075	4.10643
2080	4.1604
2085	4.17725
2090	4.17306
2095	4.16927
2100	4.16992