The data below is in a format known as tab-delimited values. You can open this file with any spreadsheet application and the data will be distributed into the appropriate rows and columns. 

Year	Percentage
1890	0
1895	5
1900	5
1905	5
1910	6
1915	12
1920	38
1925	22
1930	25
1935	44
1940	87
1945	90
1950	77
1955	68
1960	68
1965	68
1970	68
1975	50
1980	60
1985	67
1990	33
1995	33
2000	49
2005	49

Source: Goldsmith, Paul. We won, you lost. Eat that! Auckland: David Ling, 2008 p.334

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