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	Number of letters carried
1860	890
1865	4443
1870	5646
1875	10428
1880	22824
1885	35830
1890	43917
1895	29587
1900	39898
1905	71116
1910	196769
1915	242548
1920	259743
1925	294631
1930	313148
1935	288645
1940	296684
1945	140335
1950	169798
1955	180105
1960	210300
1965	263100
1970	288600
1975	351100
1980	541200
1985	580700
1990	598500
1995	753717
2000	1020530
2005	981002


Source: New Zealand Post and New Zealand Yearbooks			

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