1996

6.4

1964

7.1

1988

6.3

2001

7.3

1986

6.1

2002

6.8

2005

5.3

2003

5.9

1970

7.1

2009

6.5

1994

7.5

2014

6.7

2007

3.0

2007

4.8

1997

5.9

1980

6.6

2005

5.4

2017

1.0

1996

6.5

2022

1.0