after doing a little bit of checking, these are the routes lost since 2000 that i can come up with, there might be more, but it's a rough guide:-
1 Arvidsjaur
2 Athens
3 Banjul
4 Basle
5 Beijing
6 Bergamo
7 Berne
8 Billund
9 Bishkek
10 Bologna
11 Bolzano
12 Brescia
13 Caen
14 Chicago
15 Chisinau
16 Cologne Bonn
17 Comiso
18 Deauville
19 Detroit
20 Dhaka
21 Dinard
22 Djerba
23 Dundee
24 Dusseldorf Weeze
25 Eindhoven
26 Ercan
27 Exeter
28 Fagernes
29 Florence
30 Forli
31 Frankfurt Hahn
32 Galway
33 Genoa
34 Gibraltar
35 Goa
36 Gothenburg
37 Graz
38 Helsinki
39 Karachi
40 Kaunas
41 Kiev
42 Kiruna
43 Lahore
44 Le Havre
45 Limoges
46 Lisbon
47 Ljubljana
48 Londonderry
49 Lourdes
50 Luxembourg
51 Luxor
52 Malmo
53 Marseille
54 Minsk
55 Monastir
56 Montpellier
57 Mumbai
58 Munster
59 Mytilene
60 New Orleans
61 New York JFK
62 New York Newark
63 Newcastle
64 Nice
65 Nuremburg
66 Olbia
67 Orlando Int
68 Oslo
69 Oslo Torp
70 Paderborn
71 Paris Beauvais
72 Paris Orly
73 Peshawar
74 Philadelphia
75 Phuket
76 Plovdiv
77 Poitiers
78 Puerto Plata
79 Rennes
80 Reykjavik
81 Rotterdam
82 Rzeszow
83 Santo Domingo
84 Sharm El Sheikh
85 Stockholm
86 Stockholm Skavsta
87 Taba
88 Tashkent
89 Tehran
90 Tenerife North
91 Toronto
92 Trapani
93 Trieste
94 Valencia
95 Varna
96 Volos
97 Waterford
98 Yerevan
so if Hamburg and Hanover are lost, that would make it 100 routes.