2006

5.9

1999

5.4

1984

6.0

2002

6.7

1996

5.6

2001

6.1

1969

7.0

1994

5.7

1973

6.4

1990

3.5

1992

5.7

1973

7.5

1974

5.9

1989

6.3

2007

7.2

1987

6.0

2015

5.4

2005

6.0

2000

6.1

2002

6.4