1994

5.5

1993

7.0

2021

6.3

2019

3.6

1975

7.0

1991

6.4

2000

6.8

1997

7.7

1996

6.7

2004

6.8

1996

5.3

2001

6.6

1977

6.8

1999

7.9

1986

7.9

1990

7.4

1998

7.8

2005

7.0

1998

7.1

2006

7.8