1993

6.3

2013

6.4

1998

7.2

1994

8.4

1987

5.6

1968

6.0

1976

7.0

1980

5.0

2005

4.9

2006

5.8

2019

7.3

2023

7.0

2024

6.0

2011

7.8

2015

6.3

2012

10.0

2024

5.0

2003

0.0

2007

6.8

2015

1.0