Bar charts are proportional to percentage, and scaled.

Publication Year	Count	Percent
1901	1	0.0
1902	2	0.0
1903	1	0.0
1904	0	0.0
1905	4	0.0
1906	9	0.1
1907	12	0.1
1908	9	0.1
1909	13	0.1
1910	11	0.1
1911	26	0.2
1912	22	0.2
1913	24	0.2
1914	24	0.2
1915	14	0.1
1916	24	0.2
1917	14	0.1
1918	12	0.1
1919	15	0.1
1920	14	0.1
1921	20	0.2
1922	19	0.2
1923	29	0.3
1924	47	0.4
1925	44	0.4
1926	32	0.3
1927	24	0.2
1928	18	0.2
1929	21	0.2
1930	24	0.2
1931	14	0.1
1932	28	0.2
1933	26	0.2
1934	13	0.1
1935	23	0.2
1936	27	0.2
1937	23	0.2
1938	23	0.2
1939	21	0.2
1940	18	0.2
1941	20	0.2
1942	16	0.1
1943	13	0.1
1944	19	0.2
1945	21	0.2
1946	23	0.2
1947	29	0.3
1948	39	0.3
1949	47	0.4
1950	43	0.4
1951	46	0.4
1952	54	0.5
1953	66	0.6
1954	56	0.5
1955	50	0.4
1956	68	0.6
1957	59	0.5
1958	52	0.5
1959	55	0.5
1960	65	0.6
1961	64	0.6
1962	70	0.6
1963	79	0.7
1964	90	0.8
1965	97	0.8
1966	86	0.8
1967	120	1.0
1968	134	1.2
1969	107	0.9
1970	116	1.0
1971	143	1.3
1972	153	1.3
1973	122	1.1
1974	148	1.3
1975	189	1.7
1976	156	1.4
1977	174	1.5
1978	160	1.4
1979	218	1.9
1980	218	1.9
1981	197	1.7
1982	234	2.0
1983	201	1.8
1984	229	2.0
1985	262	2.3
1986	194	1.7
1987	202	1.8
1988	223	2.0
1989	207	1.8
1990	235	2.1
1991	207	1.8
1992	250	2.2
1993	249	2.2
1994	278	2.4
1995	274	2.4
1996	317	2.8
1997	338	3.0
1998	348	3.0
1999	352	3.1
2000	413	3.6
2001	425	3.7
2002	478	4.2
2003	487	4.3
2004	498	4.4
2005	104	0.9

Items: 105