1993

6.2

2001

7.8

1981

4.0

1990

6.9

1997

6.5

1999

5.6

1998

7.1

2002

7.1

2003

4.0

1997

6.1

2008

6.2

2004

7.5

2000

6.8

1976

6.7

2001

5.9

2001

6.4

2017

4.3

2014

6.7

1995

6.3

1986

7.2