Task: Question Understanding
Input (English): Passage: The number of ADF personnel has changed over the last 20 years. During the 1990s the strength of the ADF was reduced from around 70,000 to 50,000 permanent personnel as a result of budget cuts and the outsourcing of some military functions. The ADF began to grow from 2000 after the defence white paper released that year called for an expansion to the militarys strength, though the size of the military decreased between the 2003–04 to 2005–06 financial years due to problems with attracting further recruits. By 2009–10 the ADF was above its budgeted size, leading to reductions until 2014–15. The size of the ADF grew between the 2014–15 and 2016–17 financial years. The ADF has not met its recruitment targets over the period since the 1995–96 financial year.
Question: By how many permanent personnel was the ADF reduced in the 1990s?
Output (English): number