Task: Question Understanding
Input (English): Passage: Discovery of gold in the Boise Basin in 1862 brought settlement to the region again.  The lower Boise River was fully contained within Boise County from 1863 until the formation of Ada in 1864. Settlement of the lower Boise River west of Boise City was limited prior to the completion of the Oregon Shortline railroad.  Middleton was the first settlement of Canyon County, starting in 1863. The 1870 Census for Ada County listed 76 residents of the Boise Valley, excluding Boise City and the 1880 Census listed 44 residents at Middleton.  The arrival of the Railroad at Caldwell led to the establishment of a town there as of August, 1883.  Businessmen James A. McGee and Alexander Duffes filed the plat for nearby Nampa in 1886.  Parma was settled around the same time with the Old Fort Boise post office being moved to the towns location.  It was incorporated in 1904.  Ada County established precincts for each of the settlements with a combined 1890 Census population of 2,311.  Significant settlement of Greenleaf and Notus started around 1904 with the two settlements listed as precincts at the 1910 census.  Notus was incorporated in 1921 while Greenleaf was incorporated prior to 1980.  Melba was incorporated in 1912 while Wilder was incorporated in 1919.  The City of Star annexed a portion of territory in northeast Canyon County prior to 2007, becoming the countys ninth incorporated city.  The majority of Star is located within Ada County.
Question: How many years after Melba was incorporated was Wilder than incorporated?
Output (English): number