| 2000 | 2003 | 2005 | 2006 | 2009 | 2011 | 2014 |
No. of compounds | 8 | 15 | 18 | 18 | 21 | 28 | 31 |
No. of visitors | 12,629 | 30,170 | 39,124 | 40,535 | 46,607 | 78,835 | 98,959 |