UN budget info

Here's the best info I can find from the UN's site.

• How much does the UN cost?
  The regular budget of the UN is some $1.3 billion per year. It pays for UN activities, staff and basic infrastructure but not peacekeeping operations, which have a separate budget. All States of the UN are obligated by the Charter – an international treaty – to pay a portion of the budget. Each State's contribution is calculated on the basis of its share of the world economy.
  
• How much does the entire UN system spend each year?
  The UN system spends some $12 billion a year, taking into account the United Nations, UN peacekeeping operations, the programmes and funds, and the specialized agencies, but excluding the World Bank, the International Monetary Fund (IMF) and the International Fund for Agricultural Development (IFAD). Just over half of this amount comes from voluntary contributions from the Member States; the rest is received from mandatory assessments on those States.
• World military expenditures – some $800 billion a year – would pay for the entire UN system for more than 65 years. (And what do we actually get from that "UN system"?)

In 2002, the United States contributed 22% of the UN's "regular budget", or $283,000,000.