1974

6.8

1998

5.8

2001

3.2

2000

7.7

1978

5.6

1990

7.4

2001

7.6

2008

6.1

1995

1.0

1989

7.8

2017

5.6

2015

8.2

2002

3.0

2018

7.0

1996

7.0

1992

0.0

2001

5.0

2017

6.6

2003

6.5