Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | 1 season | 2 season | 3 season | 4 season | 5 season | 6 season |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | 2 585 169 (5 September 2007) | 3 077 507 (5 March 2008) | 2 362 818 (3 September 2008) | 3 145 066 (3 March 2009) | 3 299 051 (3 March 2010) | 3 074 536 (2 March 2011) |
| 2 | 3 005 117 (12 September 2007) | 3 527 331 (12 March 2008) | 2 464 142 (10 September 2008) | 3 451 307 (10 March 2009) | 4 132 714 (10 March 2010) | 3 376 435 (9 March 2011) |
| 3 | 3 157 210 (19 September 2007) | 3 685 660 (19 March 2008) | 3 132 212 (17 September 2008) | 3 273 440 (17 March 2009) | 3 729 185 (17 March 2010) | 3 240 345 (16 March 2011) |
| 4 | 2 839 520 (26 September 2007) | 2 965 419 (26 March 2008) | 2 995 715 (24 September 2008) | 2 916 761 (25 March 2009) | 3 425 014 (24 March 2010) | 3 296 694 (23 March 2011) |
| 5 | 2 354 477 (3 October 2007) | 3 168 673 (2 April 2008) | 3 139 541 (1 October 2008) | 2 378 640 (1 April 2009) | 3 320 209 (31 March 2010) | 3 162 112 (30 March 2011) |
| 6 | 2 436 386 (10 October 2007) | 3 267 513 (9 April 2008) | 3 790 015 (8 October 2008) | 2 523 118 (8 April 2009) | 3 212 078 (7 April 2010) | 3 116 088 (6 April 2011) |
| 7 | 2 752 179 (17 October 2007) | 3 135 031 (16 April 2008) | 3 393 677 (15 October 2008) | 2 318 115 (22 April 2009) | 2 720 927 (21 April 2010) | 3 047 739 (13 April 2011) |
| 8 | 2 717 525 (24 October 2007) | 2 949 739 (23 April 2008) | 2 983 528 (22 October 2008) | 2 404 531 (29 April 2009) | 2 378 343 (28 April 2010) | 2 352 393 (20 April 2011) |
| 9 | 2 710 372 (31 October 2007) | 2 616 401 (30 April 2008) | 2 609 340 (29 October 2008) | 2 195 119 (6 May 2009) | 2 727 223 (5 May 2010) | 2 294 207 (27 April 2011) |
| 10 | 3 149 694 (7 November 2007) | 2 692 353 (7 May 2008) | 2 691 547 (5 November 2008) | 2 101 043 (13 May 2009) | 2 540 376 (12 May 2010) | 2 512 383 (4 May 2011) |
| 11 | 3 192 178 (14 November 2007) | 2 741 304 (14 May 2008) | 3 625 397 (12 November 2008) | 2 195 767 (20 May 2009) | 2 744 185 (19 May 2010) | 2 497 440 (11 May 2011) |
| 12 | 2 876 019 (21 November 2007) | 2 525 034 (21 May 2008) | 2 970 667 (19 November 2008) | 2 151 985 (27 May 2009) | 3 013 932 (26 May 2010) | 2 497 440 (18 May 2011) |
| 13 | 4 386 793 (2 December 2007) | 3 020 502 (28 May 2008) | 3 523 767 (26 November 2008) | 2 628 383 (3 June 2009) | 2 827 035 (2 June 2010) | 2 344 082 (25 May 2011) |
| 14 | – | 3 196 605 (5 June 2008) | 2 970 536 (3 December 2008) | – | – | 2 414 215 (1 June 2011) |
| Average | 2 959 699 | 2 999 123 | 2 765 374 | 2 510 193 | 2 997 082 | 2 687 398 |
Question:
What is 4 Season, when 2 Season is "3 168 673 (2 April 2008)"?
Answer:
2 378 640 (1 April 2009)