1996

5.3

2010

6.3

2020

6.2

1991

6.5

2002

6.0

1970

6.0

2001

5.2

2004

6.6

2021

6.3

1989

5.8

2017

7.4

1994

5.7

2014

7.3

2015

8.1

2015

9.0

1971

6.8

1993

7.6

2014

7.0

2015

7.3

2020

8.1