Rogers Brubaker (2005) also notes that the use of the term diaspora has been widening. He suggests that one element of this expansion in use "involves the application of the term diaspora to an ever-broadening set of cases: essentially to any and every nameable population category that is to some extent dispersed in space". Brubaker has used the WorldCat database to show that 17 out of the 18 books on diaspora published between 1900 and 1910 were on the Jewish diaspora. The majority of works in the 1960s were also about the Jewish diaspora, but in 2002 only two out of 20 books sampled (out of a total of 253) were about the Jewish case, with a total of eight different diasporas covered.