Table:
text: Ugly Betty (season 3)
Episodes
Episodes
Episode_ Title Air_Date Rating Share_ _18_49 Viewers Rank_
58 Sugar Daddy March 5, 2009 4.3 7 1.8 6.35 #50
59 A Mother of a Problem March 12, 2009 4.9 8 2.1 7.21 #46
60 The Sex Issue March 19, 2009 5.2 9 2.2 7.82 #41
61 Rabbit Test April 30, 2009 4.7 9 2.0 6.81 TBA
62 The Born Identity May 7, 2009 4.9 9 2.1 7.49 TBA
63 In the Stars May 14, 2009 4.7 8 2.0 6.83 TBA
64 Curveball May 21, 2009 4.1 7 1.8 6.16 TBA
65 The Fall Issue May 21, 2009 4.2 7 2.0 6.37 TBA

text: Ugly Betty (season 3)
Episodes
Episodes
Episode_ Title Air_Date Rating Share_ _18_49 Viewers Rank_
50 When Betty Met YETI November 20, 2008 5.4 9 2.6 8.30 #37
51 Bad Amanda December 4, 2008 5.8 9 2.6 8.47 #38
52 Dress for Success January 8, 2009 5.0 8 2.4 7.51 #43
53 Sisters on the Verge of a Nervous Breakdown January 22, 2009 5.1 8 2.4 7.54 #42
54 Kissed Off February 5, 2009 5.0 8 2.4 7.27 #44
55 The Courtship of Betty`s Father February 12, 2009 4.9 8 2.3 7.44 #40
56 There`s No Place Like Mode February 19, 2009 5.1 8 2.3 7.65 #35
57 Things Fall Apart February 26, 2009 4.6 7 1.9 6.78 #41

Question: Regarding Ugly Betty (Season 3), what is the average episode number with a proportion of 7 and 18-49 is less than 2 and the air date is May 21, 2009?