Year	Percent of GDP (Units)
1988	17.876
1989	18.000
1990	17.748
1991	19.371
1992	18.796
1993	17.623
1994	18.211
1995	18.166
1996	17.659
1997	16.955
1998	16.292
1999	17.149
2000	17.677
2001	17.243
2002	18.043
2003	18.514
2004	19.229
2005	19.384
2006	20.529
2007	22.358
2008	20.122
2009	18.842
2010	19.190
2011	19.291
2012	19.814
2013	19.600
2014	19.149
2015	19.854
2016	20.113
2017	20.004
2018	19.952
2019	19.152
2020	18.155
2021	20.438
2022	19.785
2023	20.156
2024	20.124
2025	20.203
2026	20.255
2027	20.307
2028	20.360
2029	20.412