ECU Libraries Catalog
- 1898 to 1899 4,873
- 1900 to 1909 27,259
- 1910 to 1919 31,737
- 1920 to 1929 45,155
- 1930 to 1939 34,785
- 1940 to 1949 30,773
- 1950 to 1959 55,918
- 1960 to 1969 110,600
- 1970 to 1979 175,258
- 1980 to 1989 213,623
- 1990 to 1999 372,584
- 2000 to 2009 490,787
- 2010 to 2019 437,598