2021

6.8

2005

6.5

2008

6.8

2008

6.1

2006

7.4

1999

6.6

1980

5.6

1997

5.7

1993

6.2

1990

6.7

2002

6.2

2001

6.8

1978

6.3

1991

6.2

2000

5.8

1988

6.2

2003

5.7

1928

0.0

1994

6.7

1997

7.5