1997

4.5

2019

7.1

2002

6.3

1998

7.3

2006

5.2

1998

5.2

1995

7.5

1994

5.8

1994

7.0

1994

7.0

2015

6.1

2018

6.6

1999

10.0

1970

6.1

2020

4.0

2005

4.6

1992

3.4