Here's a list of the XP needed for each level. All skills use the same XP table. Thanks to Warcraft82, Star989, Cerise, meisterwm, Slowbyte, and Amnesia for filling in the blanks.

Level	XP Needed	Level	XP Needed
2	83	51	111945
3	174	52	123660
4	276	53	136594
5	388	54	150872
6	512	55	166636
7	650	56	184040
8	801	57	203254
9	969	58	224466
10	1154	59	247886
11	1358	60	273742
12	1584	61	302288
13	1833	62	333804
14	2107	63	368599
15	2411	64	407015
16	2746	65	449428
17	3115	66	496254
18	3523	67	547953
19	3973	68	605032
20	4470	69	668051
21	5018	70	737627
22	5624	71	814445
23	6291	72	899257
24	7028	73	992895
25	7842	74	1096278
26	2740	75	1210421
27	9730	76	1336443
28	10824	77	1475581
29	12031	78	1629200
30	13363	79	1798808
31	14833	80	1986068
32	16456	81	2192818
33	18247	82	2421087
34	20224	83	2673114
35	22406	84	2951373
36	24815	85	3258594
37	27473	86	3597792
38	30408	87	3972294
39	33648	88	3485776
40	37224	89	4842294
41	41171	90	5346632
42	45529	91	5902831
43	50339	92	6517253
44	55649	93	7195629
45	61512	94	7944614
46	67983	95	8771558
47	75127	96	9684577
48	83014	97	10692629
49	91720	98	11805606
50	101333	99	13034431