1979

5.8

2001

7.1

2005

7.0

2009

6.2

1985

7.0

1989

4.3

2003

5.5

2002

7.6

2008

5.9

2006

6.5

2019

1.3

1989

6.6

2014

1.5

2021

5.0

2018

6.7

1979

6.7

2003

6.4

1996

4.9

1985

6.6

1995

5.8