1999

5.6

1998

7.4

2001

6.7

1997

6.7

2021

4.0

2020

6.5

2000

6.3

1995

6.3

2006

5.4

2005

7.3

1975

7.9

1998

7.0

2015

7.6

1956

6.2

1963

6.6

2012

5.5

1988

5.4

2006

7.2

1994

6.3

1988

7.5