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.

Date	Number of publications
1840	2
1845	7
1850	7
1855	8
1860	19
1865	48
1870	68
1875	94
1880	114
1885	136
1890	139
1895	152
1900	151
1905	173
1910	175
1915	175
1920	166
1925	169
1930	165
1935	164
1940	140
1945	120
1950	134
1955	144
1960	153
1965	159
1970	148
1975	151
1980	165
1985	187
1990	189
1995	196
2000	205
2005	221
2010	230



See the web-page for source information

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