1989

5.9

1986

5.8

2021

7.5

2005

9.7

1977

7.3

2020

5.7

2013

8.1

2020

6.7

2002

5.2

2014

5.6

2021

9.2

2020

7.4

2009

6.1

1999

6.8

2007

5.7

2006

6.0

2021

6.1

5.4

2023

6.5