The financial crisis of 2007–2008 with the collapse in the commodities market had the US$ gain strongly against currencies backed by weakening commodities exports. With palm oil and rubber prices falling from their peak by more than half, the rupiah came under pressure, Bank Indonesia spent US$7 billion of its $57 billion reserves in October defending the currency. Despite this, the rupiah slipped below Rp 10,000 on 23 October for the first time since 2005, and then below Rp 11,000 on 2 November, a mark last reached in 2001. On 13 November, BI introduced new regulations requiring foreign currency purchases over US$100,000 a month to be backed by documentation of an underlying transaction and a tax number. The rupiah closed below Rp 12,000 for the first time since 1998 on 20 October, with intraday lows below Rp 13,000. Subsequently, however, the cut in the Federal Reserve rate to 0–0.25% and BI support for the currency, had the rupiah strengthen slightly to a range around Rp 11,000.