WTA year end last twenty years

[Clintspin]

Is it 11 out of 20 years of WTA one-handed backhand number one players?
1987 Flag of Germany GER Steffi Graf (3)
1988 Flag of Germany GER Steffi Graf
1989 Flag of Germany GER Steffi Graf
1990 Flag of Germany GER Steffi Graf
1991 Flag of Yugoslavia YUG Monica Seles (4)
1992 Flag of Yugoslavia YUG Monica Seles
1993 Flag of Germany GER Steffi Graf
1994 Flag of Germany GER Steffi Graf
1995 Flag of Germany GER
Flag of the United States USA Steffi Graf
Monica Seles
1996 Flag of Germany GER Steffi Graf
1997 SUI Martina Hingis (5)
1998 Flag of the United States USA Lindsay Davenport (6)
1999 SUI Martina Hingis
2000 SUI Martina Hingis
2001 Flag of the United States USA Lindsay Davenport
2002 Flag of the United States USA Serena Williams (7)
2003 Belgium BEL Justine Henin (8)
2004 Flag of the United States USA Lindsay Davenport
2005 Flag of the United States USA Lindsay Davenport
2006 Belgium BEL Justine Henin
2007 Belgium BEL Justine Henin