Number of Americans estimated to be living with arthritis or chronic joint pain:
1985 – 35 million
1990 – 37.9 million
1998 – nearly 43 million
2005 – 66 million: 42.7 million have doctor-diagnosed arthritis and 23.2 million people have chronic joint pain from another cause or that has not been diagnosed by a doctor.
2009 – 70 million
