Table 1. Changes in Reduced Ozone in the Upper Troposphere From the Late 1970s to Present		
Period	Number of Sondings	Percent of Reduced Ozone Events at 200 mbar		
Samoa		
1986-1990	115	10 (< 20 ppbv)
1995-1996	96	18
1997-1999	82	47
2000-2002	104	42
2003-mid 2005	73	32
Hawaii		
1982-1985	84	7 (<20 ppbv)
1986-1990	221	4
1991-1995	184	15
1996-1999	159	16
2000-2004	189	14
Natal		
1979-1982	32	3 (< 30 ppbv)
1990-1992	65	2
1997-2000	123	18
2001-2002	117	14
2003-mid 2005	103	5