en Access Healthcare Plans in USA, 1988 - 2008 ATi mee mm me = te ma i =~ Se —— Open Access (PPO + POS) —Tightly Managed (Conventional + HMO) % of All Healthcare Plans Other (HDHP) 0% T T T T T T T T T T T T T T 1 1988 1996 2000 2002 2004 2006 2008 Note: PPO is Preferred Provider Organization, which allows enroll